215554133 has 2 divisors, whose sum is σ = 215554134. Its totient is φ = 215554132.

The previous prime is 215554063. The next prime is 215554153. The reversal of 215554133 is 331455512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215003569 + 550564 = 14663^2 + 742^2 .

It is a cyclic number.

It is not a de Polignac number, because 215554133 - 2¹⁶ = 215488597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 215554096 and 215554105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215554153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107777066 + 107777067.

It is an arithmetic number, because the mean of its divisors is an integer number (107777067).

Almost surely, 2^215554133 is an apocalyptic number.

It is an amenable number.

215554133 is a deficient number, since it is larger than the sum of its proper divisors (1).

215554133 is an equidigital number, since it uses as much as digits as its factorization.

215554133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9000, while the sum is 29.

The square root of 215554133 is about 14681.7619174267. The cubic root of 215554133 is about 599.5868757978.

The spelling of 215554133 in words is "two hundred fifteen million, five hundred fifty-four thousand, one hundred thirty-three".